<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<style>
  html {
    height: 100%;
  }

  body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    background: linear-gradient(#141e30, #243b55);
  }

  .login-box {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    padding: 40px;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, .5);
    box-sizing: border-box;
    box-shadow: 0 15px 25px rgba(0, 0, 0, .6);
    border-radius: 10px;
  }

  .login-box h2 {
    margin: 0 0 30px;
    padding: 0;
    color: #fff;
    text-align: center;
  }

  .login-box .user-box {
    position: relative;
  }

  .login-box .user-box input {
    width: 100%;
    padding: 10px 0;
    font-size: 16px;
    color: #fff;
    margin-bottom: 30px;
    border: none;
    border-bottom: 1px solid #fff;
    outline: none;
    background: transparent;
  }

  .login-box .user-box label {
    position: absolute;
    top: 0;
    left: 0;
    padding: 10px 0;
    font-size: 16px;
    color: #fff;
    pointer-events: none;
    transition: .5s;
  }

  .login-box .user-box input:focus~label,
  .login-box .user-box input:valid~label {
    top: -20px;
    left: 0;
    color: #03e9f4;
    font-size: 12px;
  }

  .login-box form a {
    position: relative;
    display: inline-block;
    padding: 10px 20px;
    color: #03e9f4;
    font-size: 16px;
    text-decoration: none;
    text-transform: uppercase;
    overflow: hidden;
    transition: .5s;
    margin-top: 40px;
    letter-spacing: 4px
  }

  .login-box a:hover {
    background: #03e9f4;
    color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 5px #03e9f4,
      0 0 25px #03e9f4,
      0 0 50px #03e9f4,
      0 0 100px #03e9f4;
  }

  .login-box a span {
    position: absolute;
    display: block;
  }

  .login-box a span:nth-child(1) {
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #03e9f4);
    animation: btn-anim1 1s linear infinite;
  }

  @keyframes btn-anim1 {
    0% {
      left: -100%;
    }

    50%,
    100% {
      left: 100%;
    }
  }

  .login-box a span:nth-child(2) {
    top: -100%;
    right: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, #03e9f4);
    animation: btn-anim2 1s linear infinite;
    animation-delay: .25s
  }

  @keyframes btn-anim2 {
    0% {
      top: -100%;
    }

    50%,
    100% {
      top: 100%;
    }
  }

  .login-box a span:nth-child(3) {
    bottom: 0;
    right: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(270deg, transparent, #03e9f4);
    animation: btn-anim3 1s linear infinite;
    animation-delay: .5s
  }

  @keyframes btn-anim3 {
    0% {
      right: -100%;
    }

    50%,
    100% {
      right: 100%;
    }
  }

  .login-box a span:nth-child(4) {
    bottom: -100%;
    left: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(360deg, transparent, #03e9f4);
    animation: btn-anim4 1s linear infinite;
    animation-delay: .75s
  }

  @keyframes btn-anim4 {
    0% {
      bottom: -100%;
    }

    50%,
    100% {
      bottom: 100%;
    }
  }
</style>

<body>
  <div class="login-box">
    <h2>Login</h2>
    <form>
      <div class="user-box">
        <input id="username" type="text" name="" required="">
        <label>Username</label>
      </div>
      <div class="user-box">
        <input id="password" type="password" name="" required="">
        <label>Password</label>
      </div>
      <a href="#" id="tologin">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        登录
      </a>
      <a href="#" id="tosend">
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        注册
      </a>
    </form>
  </div>
</body>
<script>
  var tologin = document.getElementById('tologin')
  var username = document.getElementById('username')
  var password = document.getElementById('password')
  var tosend = document.getElementById('tosend')
  tologin.onclick = function () {
    ajax({
      url: "/tologin",
      methods: 'post',
      data: {
        username: username.value,
        password: password.value,
      }
    }).then(res => {
      console.log("res", res);
      if (res.code != 20000) {
        alert("账号或者密码错误")
      } else {
        //  代表密码正确 跳转页面
        location.href = "http://127.0.0.1:3200/"
      }

    })


  }

  tosend.onclick = function () {
    ajax({
      url: "/registry",
      methods: "post",
      //  发送请求去注册账号, 实际是想要数据添加一个新的用户信息
      data: {
        username: username.value,
        password: password.value,
      }

    }).then((res) => {
      username.value = ""
      password.value = ""
    })
  }




  function ajax(options2) {

    return new Promise((resolve, reject) => {
      var options = {
        url: "",
        methods: "get",
        ...options2

      }
      let { url, data, methods } = options

      if (methods.toLocaleLowerCase() == 'get') {
        var str = ""
        for (key in data) {
          str = str + key + "=" + data[key] + "&"
        }
        url = url + "?" + str + 'time=' + Date.now()
      }
      let xhr = new XMLHttpRequest()
      xhr.onreadystatechange = function () {
        if (xhr.readyState == 4 && xhr.status == 200) {
          var data = JSON.parse(xhr.response)
          resolve(data)  // 发送成功了
        } else if (xhr.readyState == 4 && xhr.status != 200) {
          //  如果发送给( xhr.readyState ==4)成功了 并且后端返回回来的状态不是  200
          //  那么就代表失败了
          reject(JSON.parse(xhr.response))
        }
      }
      xhr.open(methods, url)
      if (methods.toLocaleLowerCase() == 'post') {
        xhr.setRequestHeader('Content-Type', "application/json")

        xhr.send(JSON.stringify(data))
      } else {
        xhr.send()  // 需不需要携带参数 post请求需要携带 get 的话写url身上
      }

    })

  }
</script>

</html>